<template>
  <div class="upload-file">
    <el-upload :action="uploadFileUrl" v-if="!readOnly" :multiple="multiple" :before-upload="handleBeforeUpload"
      :file-list="fileList" :data="extParams" :on-error="handleUploadError" :on-exceed="handleExceed"
      :on-success="handleUploadSuccess" :show-file-list="false" :headers="headers" class="upload-file-uploader"
      ref="upload">
      <!-- 上传按钮 -->
      <el-button size="small" type="primary" :icon="buttonIcon">{{ buttonText }}</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize">
          大小不超过
          <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为
          <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group v-if="isShowTransition" class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear" tag="ul">
      <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in list">
        <el-link :href="file.url" :underline="false" target="_blank">
          <span class="el-icon-document">{{ getFileName(file.name) }}</span>
        </el-link>
        <div v-if="!readOnly" class="ele-upload-list__item-content-action"><el-link :underline="false"
            @click="handleDelete(index)" type="danger">删除</el-link></div>
        <div v-else class="ele-upload-list__item-content-action"><el-link :href="file.url" :underline="false"
            type="primary">下载</el-link></div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth';

export default {
  props: {
    // 值
    value: [String, Object, Array],
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['doc', 'xls', 'ppt', 'txt', 'pdf']
    },
    // 是否显示上传成功列表
    isShowTransition: {
      type: Boolean,
      default: true
    },
    // 只读模式
    readOnly: {
      type: Boolean,
      default: false
    },
    buttonText: {
      type: String,
      default: '选取文件'
    },
    multiple: {
      type: Boolean,
      default: false
    },
    buttonIcon: {
      type: String,
      default: 'el-icon-circle-plus-outline'
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    isUnZip: {
      type: Boolean,
      default: false
    },
    superPath: {
      type: String,
      default: ''
    },
    otherKey: {
      type: String,
      default: ''
    },
    otherVal: {
      type: String,
      default: ''
    },
    uploadUrl: {
      type: String,
      default: '/fileManage/upload'
    },
    showUploadSuccessMsg: {
      type: Boolean,
      default: true
    },
    // 是否重命名
    isReName: {
      type: Boolean,
      default: true
    },
    beforeValidate: {
      type: Function
    },
  },
  data() {
    return {
      valueData: this.value,
      uploadFileUrl: process.env.VUE_APP_BASE_API + this.uploadUrl, // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      fileList: [],
      extParams: {
        //额外的参数
        superPath: this.superPath
      },
      fileEntity: {}
    };
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
    // 列表
    list() {
      let temp = 1;
      if (this.valueData) {
        // 首先将值转为数组
        const list = Array.isArray(this.valueData) ? this.valueData : [this.valueData];
        // 然后将数组转为对象数组
        return list.map(item => {
          if (typeof item === 'string') {
            item = { name: item, url: item };
          }
          item.uid = item.uid || new Date().getTime() + temp++;
          return item;
        });
      } else {
        this.fileList = [];
        return [];
      }
    }
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = '';
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
        }
        const isTypeOk = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$message.error(`文件格式不正确, 请上传${this.fileType.join('/')}格式文件!`);
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.fileEntity['fileName'] = file.name.split('.')[0];
      if (!this.isReName) {
        this.extParams['name'] = file.name.split('.')[0];
      }
      if (this.isUnZip) {
        this.extParams['isUnZip'] = this.isUnZip;
      }
      if (this.otherKey && this.otherVal) {
        this.extParams[this.otherKey] = this.otherVal;
        delete this.extParams['superPath'];
      }
      this.fileEntity['fileSize'] = file.size;

      if (this.beforeValidate) {
        let validateResult = this.beforeValidate(file);
        if (validateResult) {
          this.$modal.loading('开始上传文件...');
          return true;
        }
        return false;
      } else {
        this.$modal.loading('开始上传文件...');
        return true;
      }
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.closeLoading();
      this.$message.error(`只允许上传单个文件`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.closeLoading();
      this.$message.error(err && err.message ? JSON.parse(err.message).errorDetail.message : '上传失败, 请重试');
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      this.$modal.closeLoading();
      const code = res?.code || 200;
      if (code == 200) {
        if (this.showUploadSuccessMsg) {
          this.$message.success('上传成功');
        }
        this.fileEntity['savePath'] = res.result?.path;
        if (Array.isArray(this.valueData)) {
          this.valueData.push(res.result?.path)
          this.valueData = _.uniq(this.valueData);
        } else {
          this.valueData = res.result?.path;
        }
        this.$emit('input', this.fileEntity);
        this.$emit('success', this.fileEntity);
      } else {
        this.$message.error(res.msg);
      }
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      if (Array.isArray(this.valueData)) {
        this.valueData.splice(index, 1);
      } else {
        this.valueData = '';
      }
      this.$emit('input', '');
      this.$emit('deleteIndex', index);
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf('/') > -1) {
        return name.slice(name.lastIndexOf('/') + 1).toLowerCase();
      } else {
        return '';
      }
    }
  },
  created() {
    this.fileList = this.list;
  }
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  width: 100%;

  // margin-bottom: 5px;
  ::v-deep.el-upload {
    width: 100%;
  }
}

.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
